vsftpd/0053-Always-do-chdir-after-chroot.patch

From 315f9720db94af3319c9550feaf473b9cf09aeac Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20Lyson=C4=9Bk?= <olysonek@redhat.com>
Date: Thu, 3 May 2018 13:20:28 +0200
Subject: [PATCH 53/59] Always do chdir("/") after chroot()

Always do chdir("/") after chroot() to be more sure we'll never get out
of it. This will not affect the working directory after calling
vsf_sysutil_chroot(), because in the current state vsftpd always calls
vsf_sysutil_chroot(".").
---
 sysutil.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sysutil.c b/sysutil.c
index b68583b..3014c05 100644
--- a/sysutil.c
+++ b/sysutil.c
@@ -2588,6 +2588,11 @@ vsf_sysutil_chroot(const char* p_root_path)
   {
     die("chroot");
   }
+  retval = chdir("/");
+  if (retval != 0)
+  {
+    die("chdir");
+  }
 }
 
 unsigned int
-- 
2.14.4